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GEOS-CF Evidence for Regional Near-Neutral and Weak Day–Night Reversal Signals in Surface Ozone

Year: 2026

Type: article

Abstract: Traditionally, near-surface ozone (O3) concentrations are higher during the day than at night. However, analysis of global hourly O3 reanalysis data from 2018–2025 reveals that a day–night reversal (higher nighttime than daytime concentrations) is emerging in many regions. Globally, the day–night O3 difference is diminishing, with a notable reversal already evident in parts of India, China, and selected cities in Western Europe. This shift challenges long-held assumptions about O3 diurnal patterns and has important implications for understanding regional chemistry, air quality assessment, and policy development.

Source: Global Environment Science

DOI: 10.53941/ges.2026.100018

Authors: Chao He, Qian Wu, Yanwen Wang, Peiyue Tu, Chaoqing Huang

Institutions: Wuhan Business University, Wuhan University, Deakin University, China University of Geosciences, Guangdong Eco-Engineering Polytechnic

Language: English

Topic: Atmospheric chemistry and aerosols

Subfield: Atmospheric Science

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: diamond

OpenAlex ID: W7168545783

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